dolly vs plaything

dolly and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
dolly	Yes	No	No	No
plaything	Yes	No	No	No

As nouns, plaything is a hypernym of dolly; that is, plaything is a word with a broader meaning than dolly:

Other hypernyms of dolly include toy.

dolly (noun)	plaything (noun)
a small replica of a person; used as a toy	an artifact designed to be played with
conveyance consisting of a wheeled platform for moving heavy objects
conveyance consisting of a wheeled support on which a camera can be mounted